Zusammenfassung
Using KiK-net strong-motion data recorded at eleven stations during
the 2011 off the Pacific coast of Tohoku Earthquake (the 2011 Tohoku
Earthquake), we investigate the generation and propagation of static
displacements, i.e. coseismic permanent near-field displacements.
The static displacements are calculated by double numerical integration
after removing acceleration steps from the acceleration signals.
The estimated static displacements are totally in agreement with
the land deformation measured by GEONET, the GPS network established
by the Geographical Survey Institute, despite the fact that our estimation
method is extremely simple. It is hoped that scientific studies of
this disastrous earthquake will one day lead to a real-time evaluation
system for static displacement using strong-motion data. This would
be expected to greatly improve the effectiveness of tsunami alert
systems, since tsunamis are caused by sea-floor movements during
earthquakes.
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